It's so great to be able to keep drains clear without toxins! Dms installations ltd are authorised and regulated by the financial conduct authority () we are a credit broker and not a lender, we offer credit facilities from one lender. Servicing the new orleans metro area for over + years! Combi boilers are not suitable for larger properties with , or more bathrooms. Wondering about how energy efficient your new boiler will really be? An.